Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 95, 022003 (2005). . Copyright © 2005 American Physical Society. Permission to use.


We report a measurement of the rate of prompt diphoton production in pp̅ collisions at √s =1.96 TeV using a data sample of 207 pb-1 collected with the upgraded Collider Detector at Fermilab. The background from nonprompt sources is determined using a statistical method based on differences in the electromagnetic showers. The cross section is measured as a function of the diphoton mass, the transverse momentum of the diphoton system, and the azimuthal angle between the two photons and is found to be consistent with perturbative QCD predictions.

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